Graphics - Ah, Box2DLights and particles are awesome. I wanted to use them too but didn't have enough time / skill. I also dig how you did your screen transitions, really cool! I don't know if you are aware, but on my macbook the title screen looks messed up: http://imgur.com/CDxr6Uc

Camera - I always pay close attention to game cameras and liked how you zoom out based on the ship's velocity! The downside with your camera is that it always drags behind the ship when it should be in front - players should see more of where they are going and less of where they are coming from.

Audio - no complaints here ;)

Gameplay - I agree with CiderPunk that the targets are really hard to hit because they move so fast. When I managed to destroy them, it felt like luck.

Anyhow, this is a great little game and I am looking forward to learn how you implemented it!